Cooling system for internalcombustion engines



Feb. 26, 1963 YOSHI TSUGU HAMADA 3,

COOLING SYSTEM FOR INTERNAL-COMBUSTION ENGINES v Filed Aug. 10, 1960 Ila United States Patent 3,078,831 COOLING SYSTEM FOR INTERNAL- COMBUSTION ENGINES Yoshitsugu Hamada, Nishinomiya-shi, Japan, assignor to Yasuhito Yamaoka, Kyoto, Japan Filed Aug. 10, 1960, Ser. No. 48,620 1 Claim. (Cl. 123-4152) The present invention relates to a cooling system for horizontal internal-combustion engines and more particularly to an improved cooling system therefor.

In the past the so-called hopper type cooling system has generally been used in portable water-cooled type horizontal internal-combustion engines. However, since with such cooling system, the cooling water must be frequently replenished because of evaporation a radiator type cooling system, which eliminates replenishing the cooling water, is desired. Engines of the type described equipped with a condenser type radiator are known but they only aiford a relatively low cooling elficiency because they are of the condenser type, which necessitates large radiators. These known engines are also deficient in that radiator damage occurs easily because the radiator is mounted on the engine with no protection therefor. Moreover, the known construction is ungainly and requires large space for installation.

The present invention has for an object the elimination of such deficiencies.

Another object of the present invention is to provide a cooling system of the thermal siphonic action type for internal-combustion engines which has an improved cooling efiiciency and a construction sturdy enough to eliminate being easily damaged at the same time allowing the engine to be made compact and of good appearance.

A further object of the present invention is to provide a cooling system of the kind described which enables the utilization of a space, previously not utilized, for a fuel tank while enabling the entire engine equipped with the cooling system to have a neat and balanced configuration.

A still further object of the present invention is to provide a cooling system of the kind described provided with an eye bolt which is effective and arranged in a manner so as not to impair the appearance of the entire engine assembly equipped therewith.

These and other objects, features and advantages of the present invention will be apparent from the following detailed description when read with reference to the accompanying drawing which illustrates a preferred embodiment of the present invention. In the drawing:

FIGURE 1 is a diagrammatic vertical section of an internal-combustion engine equipped with the cooling system of the present invention; and

FIGURE 2 is a diagrammatic rear view of the same showing parts of the cooling system in cross section.

Referring to the drawing, there is shown ahorizontal internal-combustion engine comprising a cylinder block 1 having a water jacket 2, formed with an opening 3 at the top thereof. Mounted on the top of the cylinder block 1 is a mounting frame 4 adapted to support a radiator and having an opening corresponding to the opening 3 as shown. A bank or banks of radiator tubes 5 is secured to the mounting frame 4 in a watertight manner. Also secured to the mounting frame 4 is a radiator housing 6 which encloses said bank of radiator tubes 5 and has an 3,078,831 Patented" F eb. 26, 1963 inclined portion 10 on which a fuel tank 11 is to be mounted. The radiator housing 6 also has for drawing in cooling air an aperture 7 formed in one side wall thereof, and an opening 8 for discharging cooling air formed in the wall of the housing on the opposite side thereof. Also provided on said opposite side of the radiator housing are a cooling fan 8 and a support bracket 9 therefor arranged in said discharge opening 8'. Being thus constructed, the cooling Water may circulate in the cooling system smooth- 1y by thermal siphonic action. Secured to the radiator mounting frame 4 is also an eye bolt 14 for use in supporting the engine.

The fuel tank 11 is affixed to the engine by securing a flanged portion 15 of a component of the tank to the cylinder block of the radiator housing. Also, a felt plate 13 is provided for protection of the fuel tank 11. The bank of radiator tubes 5 has on top thereof an upper tank 16 having at the top a pressure cap 12 secured thereto as shown. Tank 11 includes a bottom wall 11a which inclines downwardly and outwardly from the eyebolt 14 and the center of gravity which the eyebolt superposes.

To put this engine in operation, the upper tank is first filled with cooling water. The cooling fan is then driven in a conventional manner to raise a cooling air blast which serves to cool the cooling water through the intermediary of the radiator tubes. It will thus be understood that the system has an improved cooling efliciency as compared with the conventional condenser type cooling system.

Further, it will be recognized from the foregoing description that since the bank of radiator tubes is enclosed by the radiator housing, the bank of radiator tubes is fully protected by the latter from being damaged as when the engine equipped with the cooling system is overturned. Also since the cooling fan is supported by the radiator housing thus not stressing the radiator proper, the radiator is only required to have a satisfactory cooling function and thus may be made at a low cost.

In addition, the manner of mounting the fuel tank as described above enables the tank to withstand any vibration to which the tank may be subjected especially when the engine equipped therewith is mounted on a vehicle. It will also be appreciated that the cooling system of the present invention is adapted to impart a clean and compact appearance to the entire engine assembly and which is comparable to conventionl cooling systems.

What is claimed is:

A horizontal water cooled internal combustion engine comprising an engine block defining a cylinder, crank chamber and water jacket surrounding said cylinder, said block being provided with a single bore in the upper wall thereof, a radiator mounting frame connected with the upper wall of the block and having an opening aligned with the bore, a radiator having a large capacity in comparison with its volume and being disposed upon the radiator mounting frame so that the water jack communicates with the radiator solely through the bore and opening, a housing enclosing the radiator to protect the same and to form a passage thereabout, a fan mounted on the housing at on end thereof to induce cooling air through said passage, the housing being provided with an air outlet through which the air induced by the fan References Cited in the file of this patent UNITED STATES PATENTS Cushman Dec. 31, 1918 Armstrong Oct. 17, 1922 Huber June 5, 1928 Huber Feb. 18, 1936 Windberger June 6, 1939 Scarratt et a1. Aug. 24, 1943 FOREIGN PATENTS Great Britain- June 8, 1921 Great Britain' Mar. 24, 1954 

